Spectrum analyzers display the amplitude of an input signal versus frequency. Typically the frequency extends along the X-axis and the amplitude extends up the Y-axis of the display. They are used to measure the spectrum of an unknown signal within the frequency range of the particular analyzer ...

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58 views

RF Harmonics and Spectrum Analysers

Please forgive the long question. I have split it into 2 parts. I am very confused about how harmonic suppression is measured in RF system (in my case, ham radios). I have picked up a couple of the ...
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1answer
74 views

Spectrum Analyzer vs. numerical FFT-based methods?

We sample a signal over time (e.g. voltage fluctuations of a resistor). Then do a FFT-based Power Spectral Density in a PC. What advantage would a physical spectrum analyzer provide over doing the ...
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1answer
61 views

Combine two signals of different frequencies in a test setup

I have a device that is powered from a current source. The current source supplies 10A at 60Hz - the magnitude is roughly 5-10VPP. I would like to inject another signal on top of that to simulate ...
2
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2answers
186 views

Can an oscilloscope add a frequency component to my signal?

I want to check the spectrum of a DDS signal ("pure" sinewave) for undesired frequency components. The way I am doing it is by storing the waveform from a 2GS/s oscilloscope (Agilent DSO81204) and ...
0
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2answers
91 views

What power is measured by a spectrum analyzer?

Is the signal level that is shown in a spectrum analyzer power of the signal being measured. If yes then what power is it: average power, true power or peak power? Also when using a power meter for ...
7
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1answer
183 views

What does sequences like 1-3, 1-10, 1-3-10 etc in a spectrum analyzer mean?

I have read in a paper explaining spectrum analyzer basic 'When selecting the RBW(resolution BW), there is usually a 1-10 or a 1-3-10 sequence of RBWs available. More RBWs are better because this ...
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1answer
73 views

Spectrum analyzer [closed]

Do we need to connect different frequency sine wave sources to spectrum analyzer? Or will spectrum analyzer supply different frequencies of sine wave source to the DUT? Could someone explain the basic ...
0
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2answers
72 views

Choosing Oscilloscope with appropriate bandwidth for Jitter analysis

Can someone give me a rule of thumb of choosing Oscilloscope with appropriate bandwidth for the Jitter analysis of clock signals? What device is highly preferable: spectrum analyzers, frequency ...
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2k views

Can anyone explain this high-frequency “alien voodoo black magic”?

I was casually watching Mike tear down a spectrum analyser (13:30 is the relevant part, 16:50 is the awesome part), and he came across what he aptly described as "weird messed up alien voodoo black ...
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2answers
164 views

Measuring Power per Hertz of a RF signal

I am testing my communication application to see it's performance over different frequencies. So I need to measure power at different frequencies of operation. I have been told that my limitation for ...
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0answers
83 views

Capturing Data Samples of a signal centered at 13.56 MHz using GNU Radio/Real time spectrum analyzer

I am working with NFC for my research and I have to intercept the communication signal at 13.56 MHz. I am supposed to take about 80,000-100,000 data samples (in time domain) for my Matlab routine for ...
3
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1answer
140 views

finding rf 175 Mhz harmonic source

I have a device that I am pre testing to find possible issues with unintentional rf radation. The processor is a pic32 running at 80MHz, and is connected to a ti dp83848 ethernet phy in mii mode ...
3
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1answer
644 views

Disabling the camera auto white balance

I've decided to use standard web-camera as a simple spectrograph, being inspired by this website (and this one too). The device actually works, as you may see on the image: But you may see on the ...
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1answer
391 views

Building a cheap and stable microwave network analyser or oscillator (2-5GHz)

I am interested in measuring the changing dielectric constant of a liquid as it undergoes a process. My background research of scientific articles shows that the 2-5GHz range provides the best ...
2
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2answers
138 views

Does it make sense to plot the angle in an signal spectrum analyzer?

I've built a toy oscilloscope with an Arduino, acquiring the samples with the ADC and plotting the spectrum on my computer. The spectrum is the output of the FFT algorithm. You can see a video here of ...
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2answers
179 views

Spectrum Analyzer: Resolution Bandwidth vs Acquisition Time

Why a smaller resolution bandwidth (RBW) in a swept tuned spectrum analyzer RBW requires longer acquisition time?
2
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2answers
203 views

FCC verification and analyzer choice

I am in the design stage of a control surface that controls a remote audio DSP through ethernet. My plan is to target FCC 15 class A. The processor is a pic32 running at 80mhz. First question, what ...
4
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2answers
3k views

Oscilloscope with FFT or a Spectrum Analyzer?

Could someone explain to me please which aplications demand one and the other and why? As far as I read it's all about the 'db', is it true? And why?
0
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1answer
91 views

Input impedance of a GenRad 2512 Spectrum Analyzer [closed]

Does anyone know the input impedance on the General Radio Model 2512 Spectrum Analyzer?
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2answers
189 views

Generic Active Probes

I need an active probe for use with a spectrum analyzer and oscilloscope. My scope has contacts around the BNC connector for powering a compatible probe. The spectrum analyzer is a different story. ...
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2answers
367 views

how to use a spectrum analyzer?

This is a new topic to me so it would be great if someone could give me a few pointers. I have an amplifier that I would like to get the frequency response for and a spectrum analyser with Probes A, ...
0
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1answer
118 views

Do comercial spectrum analyzers show a single-sided spectrum?

If I use a Bessell function to compute sidelobe power - do I need to double this power to get the power I will read on the specan?
2
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3answers
877 views

Designing a Audio Spectrum Analyzer

I want to design a simple LED audio spectrum analyzer kinda like this. Which method would be less expensive to do: Use many filters for each frequency band, depending on how much bands and LEDS I ...
4
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2answers
212 views

What's a good spectrum analyzer to learn with?

I'm trying to learn more about building RF circuits and I want to buy a spectrum analyzer. I've looked around on ebay, and a lot of them are really expensive. I'm a student, so I don't have a lot of ...
3
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2answers
377 views

What's the cheapest way to do basic EMI testing?

I need to test that my project will not interfere with radios in the 27 - 72 MHz band. I can't afford a spectrum analyser. Nor can I afford to buy all tx/rx pairs in between 27 and 72 MHz (27, 35, ...